1901-2000 Degrees Fahrenheit 1 33.37 29.99 3.38 113 17 1965 2012 1989 1986 top-third 2 29.30 26.41 2.89 113 17 1899 2012 1989 1986 top-third 3 28.14 24.19 3.95 121 9 1912 2012 1989 1921 top-tenth 4 25.25 23.80 1.45 100 29 1899 2016 1989 1987 top-third 1986,2013 5 26.41 25.18 1.23 93 36 1899 2016 1989 1987 top-third 6 28.87 27.89 0.98 94 35 1899 2016 1989 1987 top-third 7 32.05 31.32 0.73 87 42 1917 2016 1989 1987 top-third 8 35.42 34.79 0.63 88 41 1917 2016 1989 1987 top-third 9 38.31 37.65 0.66 90 39 1917 2017 1989 1987 top-third 10 40.05 39.45 0.60 88 41 1917 2016 1989 1987 top-third 11 40.74 40.17 0.57 87 42 1917 2016 1989 1987 top-third 12 40.67 40.04 0.63 90 39 1917 2016 1989 1987 top-third 18 36.48 35.98 0.50 83 45 1918 2017 1989 1988 normal 24 40.52 40.03 0.49 88 40 1918 2017 1989 1988 top-third 36 40.49 40.02 0.47 86 41 1918 2018 1986 1989 top-third 48 40.74 40.01 0.73 94 32 1918 2019 1988 1989 top-third 60 40.74 40.00 0.74 95 30 1920 2020 1989 1990 top-third